A vacuum pump and a permanent magnetic bearing assembly for a vacuum pump
OwnerEmiliano Lucchettainventor
Life of this patent
Estimating the term…
Abstract
A passive magnetic bearing assembly for a vacuum pump and a vacuum pump having such a bearing are disclosed. The passive magnetic bearing assembly has a plurality of pairs of ring magnets arranged in a stack, a ring magnet of a pair being arranged on a stator side of the bearing and the other magnet of the pair being arranged on a rotor side. The ring magnets are radially magnetised, and each rotor ring magnet comprises at least a first harmonic of magnetic inhomogeneity, where magnetic inhomogeneity is measured as the ratio between the 0-peak variation of remanence ΔBi and the average remanence BR0, that is less than 3%.
Claims19
A passive magnetic bearing assembly for a vacuum pump, said passive magnetic bearing assembly comprising:
- a plurality of pairs of ring magnets arranged in a stack, a ring magnet of a pair being arranged on a stator side of the bearing and the other magnet of the pair being arranged on a rotor side;
- said ring magnets are radially magnetised, and each ring magnet on said rotor side comprises at least a first harmonic of magnetic inhomogeneity, wherein inhomogeneity is measured as the ratio between the 0-peak variation of remanence ΔBi and the average remanence BR0, and wherein for at least the majority of the ring magnets on the rotor side the first harmonic of magnetic inhomogeneity is less than 3%.
Dependencies are inferred from the claim text.